tests/cmake: add tests for syscall generation scripts

This commit adds tests for the fixes introduced by commits
54e3699 and
f8d3f0e.

Signed-off-by: Loek Le Blansch <loek.le-blansch.pv@renesas.com>

Author: lonkaars

tests/cmake/syscalls/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.28)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(app C)
+target_sources(app PRIVATE main.c)
+

tests/cmake/syscalls/main.c

@@ -0,0 +1,4 @@
+#include "main.h"
+
+int main(void) { return 0; }
+

tests/cmake/syscalls/main.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <zephyr/syscall.h>
+
+// fixed in commit 54e369998747ccb89c2e563c4167b4a90c8670b2
+// clang-format off
+__syscall void
+test_wrapped(int foo);
+// clang-format on
+
+// fixed in commit f8d3f0e8c83790207aabeb5c5a3b28e686224802
+__syscall void test_empty();
+
+#include <zephyr/syscalls/main.h>
+

tests/cmake/syscalls/prj.conf

@@ -0,0 +1 @@
+CONFIG_APPLICATION_DEFINED_SYSCALL=y

tests/cmake/syscalls/testcase.yaml

@@ -0,0 +1,4 @@
+tests:
+  buildsystem.syscalls:
+    build_only: true
+    platform_allow: native_sim